Which of the following is not correct?

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Question

(A) The formation of ozone from oxygen is an endothermic reaction,not an exothermic reaction.$3 O_2 \underset{	ext{silent electric discharge}}{ight

Vedclass · Accepted Answer

$3 O_2 \underset{	ext{silent electric discharge}}{ightleftharpoons} 2 O_3; \Delta H = -284.5 \ kJ$

Vedclass · Answer

(A) The formation of ozone from oxygen is an endothermic reaction,not an exothermic reaction.$3 O_2 \underset{	ext{silent electric discharge}}{ightleftharpoons} 2 O_3 \quad \Delta H = +284.5 \ kJ \ 	ext{mol}^{-1}$.Therefore,the statement $3 O_2 \underset{	ext{silent electric discharge}}{ightleftharpoons} 2 O_3; \Delta H = -284.5 \ kJ$ is incorrect because the enthalpy change is positive,not negative.

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